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Nataly_w [17]
3 years ago
9

I dont understamd this problem please help------!

Mathematics
1 answer:
UkoKoshka [18]3 years ago
4 0
Hello,

Let's D_1\ the \ outflow\ of\ the\ new\ pump\\
D_2\ the \ outflow\ of\ the\ old\ pump\\\\
V \ the\ volume \of\ the\ tank\\\\

D_1*5=V==\ \textgreater \ D_1= \dfrac{V}{5} \\

D_2*7=V==\ \textgreater \ D_2= \dfrac{V}{7} \\

D_1+D_2= \dfrac{V}{5}+ \dfrac{V}{7} \\

D_1+D_2= \dfrac{7*V}{35}+ \dfrac{5*V}{35} \\

D_1+D_2= \dfrac{12V}{35} \\

Time \ for \ the \2 \pumps=V=(D_1+D_2)*\dfrac{35}{12}==>2H55min
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Help me, please. Please also explain to me why you picked your answer.
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3 years ago
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Answered A bicycle normally sells for 239.99 dollars. It is now on sale for 25% off. As an employee, Baron is able to save an ex
atroni [7]

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$78

Step-by-step explanation:

Savings = (normal price) – (discounted price)

If the item is 25% off, then the discounted price will be 75% of the original price: .75(239.99) = 179.9925.

Baron also gets 10% off of this price, so the total discounted price will be 90% of the already-discounted price: .9(179.9925) = 161.99325.

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i got it right

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